Tuesday, May 7, 2013 - 3:00 AM
"The Case of the Fitness Challenge"
The tree house detectives are eager to win the Presidential Physical Fitness Award, but one of the detectives is not quite up to the challenge. They decide that it is time for a little research to learn more about being fit. They visit NASA to learn more about muscles, bones, and physical activity and why fitness is the key to space exploration.G